packed_data_container.h

/**************************************************************************/
/*  packed_data_container.h                                               */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "Software"), to deal in the Software without restriction, including    */
/* without limitation the rights to use, copy, modify, merge, publish,    */
/* distribute, sublicense, and/or sell copies of the Software, and to     */
/* permit persons to whom the Software is furnished to do so, subject to  */
/* the following conditions:                                              */
/*                                                                        */
/* The above copyright notice and this permission notice shall be         */
/* included in all copies or substantial portions of the Software.        */
/*                                                                        */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
/**************************************************************************/

#pragma once

#include "core/io/resource.h"

class PackedDataContainer : public Resource {
	GDCLASS(PackedDataContainer, Resource);

	enum : uint32_t {
		TYPE_DICT = 0xFFFFFFFF,
		TYPE_ARRAY = 0xFFFFFFFE,
	};

	struct DictKey {
		uint32_t hash;
		Variant key;
		bool operator<(const DictKey &p_key) const { return hash < p_key.hash; }
	};

	Vector<uint8_t> data;
	int datalen = 0;

	uint32_t _pack(const Variant &p_data, Vector<uint8_t> &tmpdata, HashMap<String, uint32_t> &string_cache);

	Variant _iter_init_ofs(const Array &p_iter, uint32_t p_offset);
	Variant _iter_next_ofs(const Array &p_iter, uint32_t p_offset);
	Variant _iter_get_ofs(const Variant &p_iter, uint32_t p_offset);

	Variant _iter_init(const Array &p_iter);
	Variant _iter_next(const Array &p_iter);
	Variant _iter_get(const Variant &p_iter);

	friend class PackedDataContainerRef;
	Variant _key_at_ofs(uint32_t p_ofs, const Variant &p_key, bool &err) const;
	Variant _get_at_ofs(uint32_t p_ofs, const uint8_t *p_buf, bool &err) const;
	uint32_t _type_at_ofs(uint32_t p_ofs) const;
	int _size(uint32_t p_ofs) const;

protected:
	void _set_data(const Vector<uint8_t> &p_data);
	Vector<uint8_t> _get_data() const;
	static void _bind_methods();

public:
	virtual Variant getvar(const Variant &p_key, bool *r_valid = nullptr) const override;
	Error pack(const Variant &p_data);

	int size() const;

	PackedDataContainer() {}
};

class PackedDataContainerRef : public RefCounted {
	GDCLASS(PackedDataContainerRef, RefCounted);

	friend class PackedDataContainer;
	uint32_t offset = 0;
	Ref<PackedDataContainer> from;

protected:
	static void _bind_methods();

public:
	Variant _iter_init(const Array &p_iter);
	Variant _iter_next(const Array &p_iter);
	Variant _iter_get(const Variant &p_iter);

	int size() const;
	virtual Variant getvar(const Variant &p_key, bool *r_valid = nullptr) const override;

	PackedDataContainerRef() {}
};